#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

int main()
{
	int n = 1, a = 2;
	long long chenji = 1;
	while (n <= 5)
	{
		n++;
		a = a + 2;
		chenji = chenji * a;
	}
	printf("%d", chenji);
	return 0;
}